U.S. patent application number 16/293177 was filed with the patent office on 2020-09-10 for planter row unit downforce control with ground view sensor.
The applicant listed for this patent is Deere & Company. Invention is credited to Michael E. Frasier, Lawrence D. Green, Donald K. Landphair, James Z. Liu, Jason D. Walter.
Application Number | 20200281111 16/293177 |
Document ID | / |
Family ID | 1000003973657 |
Filed Date | 2020-09-10 |
United States Patent
Application |
20200281111 |
Kind Code |
A1 |
Walter; Jason D. ; et
al. |
September 10, 2020 |
PLANTER ROW UNIT DOWNFORCE CONTROL WITH GROUND VIEW SENSOR
Abstract
A row unit for a seeding machine includes a ground view sensor
coupled to the frame. The ground view sensor is operable to sense
the furrow and generate depth signals corresponding to actual
sensed depth of the furrow. The row unit also includes a controller
configured to receive the signals, and a downforce adjustment
mechanism coupled to the frame and to the controller. The
controller is configured to activate the downforce adjustment
mechanism to adjust a downforce on the frame based on the signals
received by the controller.
Inventors: |
Walter; Jason D.;
(Bettendorf, IA) ; Frasier; Michael E.; (Iowa
City, IA) ; Green; Lawrence D.; (Bettendorf, IA)
; Liu; James Z.; (Venice, FL) ; Landphair; Donald
K.; (Bettendorf, IA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Deere & Company |
Moline |
IL |
US |
|
|
Family ID: |
1000003973657 |
Appl. No.: |
16/293177 |
Filed: |
March 5, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A01C 7/203 20130101;
A01B 63/008 20130101; A01C 5/068 20130101; A01C 5/064 20130101;
A01B 49/06 20130101; A01C 7/208 20130101 |
International
Class: |
A01C 7/20 20060101
A01C007/20; A01C 5/06 20060101 A01C005/06; A01B 49/06 20060101
A01B049/06; A01B 63/00 20060101 A01B063/00 |
Claims
1. A row unit for a seeding machine operable to plant seeds into
soil, the row unit comprising: a frame supporting a furrow opener
for opening a furrow in the soil, a gauge wheel for rolling atop
the soil, a seed meter for dispensing seeds into the furrow, and a
furrow closer for closing the furrow; a downforce adjustment
mechanism operable to push the row unit frame toward the soil to
engage the furrow opener, the gauge wheel, and the furrow closer
with the soil; a ground view sensor operable to sense the furrow
and generate depth signals corresponding to actual sensed depth of
the furrow; and a controller configured to receive the depth
signals and output a control signal to the downforce adjustment
mechanism, wherein the controller is programmed to adjust the
downforce adjustment mechanism to adjust a downforce on the frame
based on the depth signals such that downforce is increased in
response to the depth signal indicating a depth less than a set
point depth, and downforce is decreased in response to the depth
signal indicating a depth greater than the set point depth.
2. The row unit of claim 1, wherein the controller is programmed to
carry out closed-loop furrow depth adjustment through the depth
signals and control of the downforce adjustment mechanism.
3. The row unit of claim 2, wherein the controller is further
configured to carry out the closed-loop furrow depth adjustment
with soil moisture content data delivered to the controller from
the ground view sensor.
4. The row unit of claim 1, wherein a height difference, measured
perpendicular to a soil top surface, between respective lowest
points of the gauge wheel and the furrow opener defines a furrow
depth setting, wherein the furrow depth setting is adjustable and
used by the controller in determining the set point depth, and
wherein the adjustment of the downforce by the controller is
configured to further adjust actual furrow depth, without changing
the furrow depth setting.
5. The row unit of claim 1, wherein the ground view sensor is
operable to emit sound or electromagnetic radiation into the furrow
and to detect a reflection of the sound or electromagnetic
radiation in order to sense the furrow.
6. The row unit of claim 1, wherein the ground view sensor
comprises an infrared sensor.
7. The row unit of claim 1, wherein the ground view sensor
comprises an ultrasonic sensor.
8. The row unit of claim 1, wherein the ground view sensor is one
of a plurality of ultrasonic sensors spaced along a longitudinal
direction of the row unit that extends between the furrow opener
and the furrow closer.
9. The row unit of claim 8, wherein the plurality of ultrasonic
sensors includes at least one ultrasonic sensor operable to view
the ground outside the furrow.
10. The row unit of claim 1, wherein the ground view sensor
comprises a radar transmitter and receiver.
11. The row unit of claim 1, wherein the ground view sensor
comprises an optical emitter and receiver.
12. The row unit of claim 1, wherein the ground view sensor is
positioned on the frame to be longitudinally aligned with the
furrow opener and the furrow closer.
13. A control system for adjusting downforce on a row unit for a
seeding machine based on depth of a seeding furrow, the control
system comprising: a ground view sensor operable to sense the
furrow and generate depth signals corresponding to actual sensed
depth of the furrow; and a processor configured to receive the
depth signals from the ground view sensor and further configured to
send signals to the downforce adjustment mechanism to adjust a
downforce based on the depth signals in order to provide
closed-loop furrow depth adjustment.
14. The control system of claim 13, wherein the processor is
configured to adjust the downforce based additionally on signals
received from at least one additional ground view sensor on the row
unit.
15. The control system of claim 13, wherein the controller is
further configured to provide the closed-loop furrow depth
adjustment by using soil moisture content data that is derived from
analog parameters and/or digital data of the ground view sensor and
delivered to the controller.
16. The control system of claim 13, wherein the ground view sensor
is operable to emit sound or electromagnetic radiation into the
furrow and to detect a reflection of the sound or electromagnetic
radiation in order to generate the depth signals.
17. The control system of claim 13, wherein the ground view sensor
is one of a plurality of ultrasonic sensors, including at least one
ultrasonic sensor operable to view the ground outside the
furrow.
18. The row unit of claim 13, wherein the ground view sensor
comprises a radar transmitter and receiver.
19. The row unit of claim 13, wherein the ground view sensor
comprises an optical emitter and receiver.
20. The row unit of claim 13, wherein the ground view sensor is
arranged to view along a center of a width of the furrow.
Description
BACKGROUND
[0001] The present disclosure relates to systems and methods for
planting seeds, in particular with a row unit for a seeding
machine.
[0002] Various factors affect crop yields. One factor, for example,
is seed depth in a furrow. A productive crop yield is typically one
that grows and emerges uniformly from the soil. Understanding
planting depth provides valuable information that may be used to
generate a productive crop yield.
SUMMARY
[0003] In one aspect, the disclosure provides a row unit for a
seeding machine. The row unit includes a frame supporting a furrow
opener for opening a furrow in the soil, a gauge wheel for rolling
atop the soil, a seed meter for dispensing seeds into the furrow,
and a furrow closer for closing the furrow. The row unit further
includes a downforce adjustment mechanism operable to push the row
unit frame toward the soil to engage the furrow opener, the gauge
wheel, and the furrow closer with the soil. A ground view sensor of
the row unit is operable to sense the furrow and generate depth
signals corresponding to actual sensed depth of the furrow. A
controller is configured to receive the depth signals and output a
control signal to the downforce adjustment mechanism, and the
controller is programmed to adjust the downforce adjustment
mechanism to adjust a downforce on the frame based on the depth
signals such that downforce is increased in response to the depth
signal indicating a depth less than a set point depth, and
downforce is decreased in response to the depth signal indicating a
depth greater than the set point depth.
[0004] In another aspect, the disclosure provides a control system
for adjusting downforce on a row unit for a seeding machine based
on depth of a seeding furrow. The control system includes a ground
view sensor operable to sense the furrow and generate depth signals
corresponding to actual sensed depth of the furrow. A processor is
configured to receive the depth signals from the ground view sensor
and further configured to send signals to the downforce adjustment
mechanism to adjust a downforce based on the depth signals in order
to provide closed-loop furrow depth adjustment.
[0005] Other aspects of the disclosure will become apparent by
consideration of the detailed description and accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 is a perspective view of a seeding machine.
[0007] FIG. 2 is a partially schematic side view of a row unit of
the seeding machine of FIG. 1, including ground view sensors
according to an exemplary embodiment.
[0008] FIG. 3 is a flowchart illustrating a process for downforce
control based on information from the ground view sensors of the
embodiment of FIG. 2.
DETAILED DESCRIPTION
[0009] Before embodiments of the disclosure are explained in
detail, it is to be understood that the disclosure is not limited
in its application to the details of construction and the
arrangement of components set forth in the following description or
illustrated in the accompanying drawings. The disclosure is capable
of supporting other embodiments and of being practiced or of being
carried out in various ways.
[0010] FIG. 1 illustrates a seeding machine 10 (e.g., a row crop
planter). The seeding machine 10 includes a main frame 14. A
plurality of individual row units 18 are coupled (e.g., mounted) on
a rear portion of the main frame 14 such that the row units 18 are
pulled over or across a layer of soil 20. Alternatively, the row
units 18 may be positioned forward of the frame 14 and are pushed
over or across the soil layer 20, or the machine may have a
combination of push and pull row units 18. Seed sources, such as
storage tanks 22a-22c, are coupled to the main frame 14 and hold
seed that is delivered, e.g., pneumatically or in any other
suitable manner, to a mini-hopper (not shown) associated with each
row unit 18. The storage tanks 22a-22c are coupled to the
mini-hoppers by way of conduits 26, such as hoses, and a
pressurized delivery apparatus (not shown). Each storage tank
22a-22c contains the same or different varieties of seed to be
planted in the soil 20. Each row unit 18 is connected to a conduit
26 such that each row unit 18 is coupled to a storage tank 22a-22c
to receive seed. As illustrated by way of example only in FIG. 1,
each row unit 18 further includes its own sub-frame 30, to which
various components (e.g., a furrow opener, a furrow closer, etc.)
are mounted.
[0011] FIG. 2 illustrates an example of a row unit 118 that may be
used in place of any one of the row units 18 in FIG. 1. Similar to
the row unit 18, the row unit 118 is also coupled to the main frame
14. In some constructions, a plurality of row units 118 are coupled
to the main frame 14, similar to the row units 18 in FIG. 1. As
illustrated in FIG. 2, each row unit 118 includes hoppers 122a,
122b, which hold chemical and seed, respectively (as opposed to the
row unit 18 receiving seed from bulk storage as in the construction
illustrated in FIG. 1). The hoppers 122a, 122b are coupled to a row
unit sub-frame 130. Each row unit 118 also includes a gauge wheel
or wheels 132 coupled to the row unit sub-frame 130. The gauge
wheel 132 contacts and rolls along the soil 20, and a furrow opener
134 (e.g., an opening wheel or blade or other structure having a
stationary or rotating surface that contacts and moves soil away to
form a furrow) is coupled to the row unit sub-frame 130 for forming
a furrow 136 (illustrated schematically) in the soil 20. A seed
metering device 138 coupled to the row unit sub-frame 130 receives
seeds from the hopper 122b and meters and dispenses the seeds into
the furrow 136. A furrow closer 140 (e.g., a closing and packing
wheel or wheels or other structure having a stationary or rotating
surface that contacts and presses soil 20) coupled to the row unit
sub-frame 130 pushes soil around the seeds to close the furrow 136.
Each row unit 118 may also include a seed firmer 144 (e.g. an
angled arm as illustrated in FIG. 2, a press wheel coupled to a
press wheel arm, or other structure that firms a seed) coupled to
the row unit sub-frame 130 that firms each seed and pushes it into
the open furrow 136 to ensure good seed to soil contact before the
furrow 136 is closed. FIG. 2 also illustrates an optional coulter
wheel 22 and row cleaner 23 forward of the furrow opener 134.
[0012] The row unit 118 also includes a downforce adjustment
mechanism 174 coupled to the main frame 14 and to the row unit
sub-frame 130. The downforce adjustment mechanism 174 includes
springs, pneumatics, hydraulics, linkages, and/or other structures
such that when the downforce adjustment mechanism is activated, the
downforce adjustment mechanism 174 pushes the row unit sub-frame
130 of the row unit 118 and consequently the furrow opener 134 into
the soil 20 to dig the furrow 136. The gauge wheels 132, however,
continue to ride along the top surface 158 of the soil 20. A depth
154 of the furrow 136 is measured from a top surface 158 of the
soil 20 to the bottom 162 of the furrow 136, along a direction that
is perpendicular to the top surface 158 (assuming a flat,
non-inclined top surface 158), and therefore depends on a position
of the gauge wheels 132 relative to the furrow opener 134. In some
constructions, the depth 154 is equivalent to a distance between a
bottom of the gauge wheel or wheels 132 and a bottom of the furrow
opener 134.
[0013] With continued reference to FIG. 2, the gauge wheel(s) 132
are coupled to the sub-frame 130 with respective arms 166 and
respective pivots 170. Stops 186 are also provided for each gauge
wheel arm 166 to limit the upward rotation of each gauge wheel arm
166. The stops 186 are adjustable to a desired position to set the
depth 154 of the furrow 136. The position of the stops 186 may be
manually adjusted or a remote adjustment assembly may be included
such as shown in U.S. Pat. No. 4,413,685, the entire contents of
which are incorporated herein by reference. However, during
operating conditions the gauge wheel arms 166 may not always be
contacting the stops 186, and thus the actual depth 154 may not be
determined solely by knowing the position of the stops 186.
Additionally, the furrow opener 134 can wear during use, altering
the actual depth 154. Thus, relying on the stops 186 alone is not
sufficient to determine the actual depth 154 of the furrow 136 at
any given time.
[0014] Each row unit 118 also includes at least one ground view
sensor 148A operable to view toward and directly detect a surface
of the ground. The illustrated ground view sensor 148A is operable
to view into the furrow 136. The ground view sensor 148A is
supported directly or indirectly by the sub-frame 130. The ground
view sensor 148A may operate alone or with one or more additional
ground view sensors (not shown) over the furrow 136 to view into
and directly detect the furrow 136 (e.g., at the furrow bottom 162)
and generate depth signals corresponding to an actual direct
measurement of a depth 154 of the furrow 136. As mentioned herein,
knowledge of the position of the gauge wheels 132 can yield a value
corresponding to furrow depth 154. However, the ground view sensor
148A of FIG. 2 is adapted to detect furrow depth 154 directly,
without reliance on detection of gauge wheels 132, gauge wheel arms
166, or other assumed dimensional values. By divorcing the ground
view sensor 148A from measurement of the gauge wheels 132 and gauge
wheel arms 166, complications arising from the variation among
independent movements of the gauge wheels 132 and gauge wheel arms
166 of a given row unit 118 are avoided.
[0015] With reference to FIG. 2, the ground view sensor 148A
described herein is positioned rearward of an effective point of
the opener 134 (i.e., the longitudinal location at which the opener
134 opens the furrow 136) and forward of an effective point of the
closer 140 (i.e., the longitudinal location at which the closer 140
closes the furrow 136) so as to be located above the furrow 136 and
to overlap the furrow 136 in plan view. In some constructions, the
ground view sensor 148A is centered over the width of the furrow
136 in a direction perpendicular to the longitudinal direction
(i.e., the furrow width direction extends into the page when
viewing FIG. 2). As illustrated, the ground view sensor 148A is
also positioned rearward of a point of contact of the gauge
wheel(s) 132 with the soil 20. The ground view sensor 148A can be
operable to emit (i.e., from one or more emitters) sound or
electromagnetic radiation into the furrow 136 and to detect (i.e.,
from one or more receivers) a reflection of the sound or
electromagnetic radiation from the furrow in order to sense the
furrow 136. The ground view sensor 148A thus forms a furrow depth
sensor 148A. In other constructions, the ground view sensor 148A
can be a passive sensor that senses the furrow 136 to measure
furrow depth by detection of the furrow 136 only, without the
sensor 148A emitting any sound or electromagnetic radiation.
[0016] In some constructions, the ground view sensor 148A is an
optical sensor, and may include a photodiode operable to detect
light, either within or outside of the visible spectrum. In some
constructions, the sensor 148A comprises an infrared sensor, which
may be referred to as an IR camera. Such an IR camera can detect
the depth of the furrow 136, and may additionally detect the
temperature of the furrow 136. The dispensed seeds may have a
discernable temperature difference from the soil of the furrow 136,
thus enabling seed identification and also seed position data to be
collected from the ground view sensor 148A. In some constructions,
the sensor 148A comprises an ultrasonic sensor, including an
emitter operable to emit ultrasound waves and a receiver operable
to detect reflected ultrasound waves that reflect off the furrow
136. In some constructions, the sensor 148A comprises a radar
transmitter and receiver. In some constructions, the sensor 148A
comprises a laser and a photodetector and may be referred to as a
LiDAR or LADAR sensor. With appropriate placement and
configuration, the ground view sensor 148A can detect a shape of
the furrow 136, rather than just the maximum or central depth
thereof. Thus, furrow shape data (i.e., 2-D or 3-D) can also be
collected by the ground view sensor 148A. Optionally, more than one
such sensor can be positioned above the furrow 136, either for
redundancy or collaboratively detecting the furrow depth 154.
Multiple sensors can be of the same type or a combination of
different types. Multiple sensors can be positioned at the same
longitudinal position on the row unit 118 or at spaced positions
along the longitudinal direction. The illustrated sensor 148A is
supported on a mounting arm that supports the furrow closer 140. In
other constructions, the sensor 148A is supported by another
structure of the row unit 118, e.g., a dedicated sensor arm or
bracket, direct connection to the sub-frame 130, etc.
[0017] Although in some constructions, the row unit 118 includes
only one or more ground view sensor 148A positioned directly over
the furrow 136, FIG. 2 illustrates an optional complement of one or
more additional ground view sensors 148B, 148C positioned outside
the furrow 136 (e.g., adjacent, but ahead of the furrow 136). These
additional ground view sensor(s) 148B, 148C are also supported
directly or indirectly by the sub-frame 130. These additional
sensor(s) 148B, 148C can utilize any of the type(s) of sensing
technology described above for the furrow-viewing sensor 148A.
Although the additional sensor(s) 148B, 148C cannot sense the
furrow 136 directly, they can still operate as ground viewing
sensors used in providing respective output signals related to the
furrow depth 154. For example, when there is significant crop
residue on the soil 20, the additional sensor(s) 148B, 148C ahead
of the furrow 136 can detect how deep the opener 134 is into the
soil 20. This is done by detecting reflected electromagnetic
radiation off the top soil surface 158, in combination with the
known positional relationship between the opener 134 and the
sensor(s) 148B, 148C, since both are fixed with respect to the
sub-frame 130. Measurement data collected this way can be used
together with the primary over-the-furrow sensor(s) 148A for
redundancy, complementation, or compensation. The additional
sensor(s) 148B, 148C can be positioned at a variety of locations on
the row unit 118, at the same or different longitudinal positions.
As illustrated, a first of the additional sensors 148B is supported
on a forward end of the sub-frame 130, for example adjacent a
linkage (parallel four-bar linkage) that couples the sub-frame 130
to the main frame 14. A second additional sensor 148C is
illustrated as being supported on one of the links of the linkage,
although other positions are optional. The sensors 148A, 148B, 148C
can be aimed to point straight down, such that the sound and/or
electromagnetic radiation emitted makes a 90-degree angle with the
top surface 158 of the soil 20 as shown. In other constructions,
one or more of the sensors 148A, 148B, 148C is or are aimed to
point predominantly downward toward the soil 20, at an angle other
than 90 degrees.
[0018] As illustrated in FIG. 2, in some constructions, ground
detection signals from the ground view sensor(s) 148A, 148B, 148C
are sent to a controller 178, which may calculate or interpret the
depth 154 directly based on the ground detection signals. With
respect to any sensor(s) 148A over the furrow 136, the only
potential calculation that may be needed is simply the
interpretation of distance (e.g., from pulse reflection time) since
the sensor 148A operates on direct observation of the furrow bottom
162. In some constructions, the signal output from the sensor(s)
148A may be already conditioned to represent the depth before
reporting to the controller 178. The controller 178, when coupled
to a global positioning system (GPS) signal processor, may generate
a seed depth map and store that map for later analysis. In some
constructions a display 182 is also provided (e.g., in an operator
cab), which displays (e.g., in real time) the measured depth 154.
The controller 178 may be positioned at various locations on
seeding machine 10. For example, in some constructions the
controller 178 is positioned within the operator cab, and signals
are sent by wire or wirelessly from the sensor(s) 148A, 148B, 148C
to the controller 178. In some constructions the sensor(s) 148A,
148B, 148C themselves each or collectively include a controller(s)
178. Other constructions include different locations for the
controller 178. The provision of the sensor(s) 148A, 148B, 148C
can, in some constructions, eliminate the need for depth
calibration or calculation.
[0019] In some constructions the ground view sensor(s) 148A, 148B,
148C described herein provides (provide) signals to the controller
178 that correspond to the depth 154 of the furrow 136. The
controller 178 (which may include a memory and a processor for
receiving and sending signals and performing calculations) uses the
received signals to activate and control movement of the downforce
adjustment mechanism 174 and to thus control an overall downforce
applied to the row unit 18.
[0020] FIG. 3 illustrates one method of controlling downforce. In a
first step 274, one or more of the ground view sensor(s) 148A,
148B, 148C, including at least the depth sensor 148A, generates
(generate) signals. For the purpose of the flowchart of FIG. 3, the
ground view sensor(s)--whether embodied as the singular sensor
148A, or as a plurality of sensors including the sensor 148A--are
(is) referred to collectively as the depth sensor(s) 148. In a
second step 278, the controller 178 receives the signals from the
depth sensor(s) 148 (e.g., wirelessly or with a wired connection).
In a third step 282, the controller 178 determines through an
algorithm whether the depth 154 of the furrow 136 is within a
suitable range of a target value and/or whether the depth is
remaining consistent as the seeding machine 10 travels along a
field, based on the signals received from the depth sensor(s) 148.
If the controller 178 determines that the depth 154 of the furrow
136 is not remaining consistent (e.g., a range of averaged depth
being equal to or greater than a preset limit value during a
predetermined period of time), then in a fourth step 298, the
controller 178 sends a signal to the downforce adjustment mechanism
174, and in a fifth step 302 the downforce adjustment mechanism 174
activates and adjusts (e.g., increases) the downforce on the row
unit 18 to maintain a more consistent furrow depth. Once the
downforce has been adjusted, the process repeats, such that the
controller 178 is continuously receiving signals from the depth
sensor(s) 148 and is continuously making adjustments to the
downforce as needed (e.g., creating a closed loop). A similar
process for closed-loop control can also be based more simply on
whether the measured furrow depth 154 exceeds or fails to meet a
desired set point, resulting in a corresponding decrease or
increase in downforce via the downforce adjustment mechanism 174
(e.g., by an amount corresponding to the difference between actual
measured depth and the set point).
[0021] In some constructions, the controller 178 additionally or
alternatively uses the signals from the depth sensor(s) 148,
including at least the depth sensor 148A, to control a forward
travel speed of the seeding machine 10 (and its row unit or units
118). For example, in some constructions the controller 178
decreases the forward travel speed of the seeding machine 10 (e.g.,
via communication with a drive or motor of the seeding machine 10,
for example, communication with a tractor pulling the seeding
machine 10) if the controller 178 determines that the depth 154 of
the furrow 136 is not remaining consistent for a predetermined
period of time (e.g., one second, two seconds, three seconds,
etc.). After adjusting the speed, the process may repeat, such that
the controller 178 is continuously receiving signals from the
position sensor or sensors 148 and is continuously making
adjustments to the seeding machine speed as needed (e.g., creating
a closed loop). In some constructions the downforce is increased
and the seeding machine speed is decreased if the controller 178
determines that the depth of the furrow 136 is not remaining
consistent for the predetermined period of time. If the controller
178 determines that the depth 154 of the furrow 136 is remaining
consistent, then the downforce may be reduced (and in some
constructions speed also changed). In some constructions, the
controller 178 uses an algorithm that determines a maximum speed at
which the seeding machine 10 (and its row unit or units 118) may
move forward while still maintaining a consistent furrow depth. In
other constructions, the controller 178 uses an algorithm that
determines a minimum downforce at which the seeding machine 10 may
maintain a consistent furrow depth.
[0022] In some constructions, the operator may set a desired
forward travel speed (e.g., 6 mph, 8 mph, 10 mph, 12 mph, 14 mph,
etc.), a maximum depth variation range (e.g., 0.1 inch, 0.3 inch,
0.5 inch, 0.7 inch, 0.9 inch, etc.), and a maximum downforce (e.g.,
50 lb, 100 lb, 150 lb, 200 lb, 250 lb, 300 lb, 350 lb, 400 lb,
etc.). If the controller 178 determines that the depth 154 of the
furrow 136 is remaining consistent (i.e., that the depth variation
range is equal to or less than the maximum depth variation range)
and that the downforce is equal to or less than the maximum
downforce, the controller 178 then operates the seeding machine 10
at the desired forward travel speed. If the controller determines
that the depth 154 of the furrow 136 is not remaining consistent
(i.e., the depth variation range is greater than the maximum depth
variation range) or that the downforce is more than the maximum
downforce, the controller 178 then slows the forward travel speed
so that the depth consistency and the downforce may be within the
desired values.
[0023] In some constructions, the seeding machine 10 utilizes a
soil map (e.g., stored within a memory of the controller 178,
and/or created manually). For example, in some constructions the
controller 178 determines what settings (speed and downforce) are
desirable to achieve the greatest furrow depth consistency,
depending on different locations and soil conditions in a field.
The controller 178 may then revert back to those settings the next
time the seeding machine 10 is in that location of the field (or in
another location of the field with the same type of soil),
automatically choosing the same settings that obtained the greatest
furrow depth consistency. In some constructions, the operator
establishes different parameters for different soil types, and uses
the stored soil map to set limits on the downforce and depth
consistency for different types of soil on the map. For example, in
sandy soil in which compaction may not be a concern, the operator
may forego setting a maximum downforce and instead only control the
forward travel speed to control the furrow depth consistency. In
clay soil, in which compaction is more of a concern, the operator
may set a lower maximum value for downforce and the speed may be
decreased to obtain the desired furrow depth consistency. Overall,
use of the soil map aids in establishing downforce and speed
settings that will obtain desired furrow depth consistency in
different field locations having different soil types.
[0024] Soil moisture may be used as another factor to include as a
parameter for down force. For example, if the soil is wetter (i.e.,
has higher moisture), the maximum downforce parameter may be
lowered for that area of the field to minimize soil compaction.
Moisture may be determined in a variety of ways, to include a soil
moisture sensor on the seeding machine 10 to determine moisture
level in real time; mapped moisture data from previous moisture
sensing; historical moisture data such as identified areas that
typically have higher moisture during planting than other areas in
the field based on topography or drainage systems, etc. In some
constructions, one of the ground view sensors 148A, 148B, 148C
disclosed herein for measuring furrow depth 154 may also be used,
alone or in combination, for measuring soil moisture content, with
soil moisture content derived from the signature of the reflection
of the sound or electromagnetic radiation emitted toward the soil
20, preferably inside the furrow 136, although soil moisture data
may be taken adjacent the furrow 136 in addition or as an
alternative. The soil moisture content data can be derived from the
analog parameters and/or digital data from the above mentions
sensor(s) 148A, 148B, 148C, particularly sound/ultrasound or
electromagnetic radiation/RF sensors. For example, soil moisture
content variations change the dielectric constant of the soil and
hence, change the reflection of RF waves (i.e., the intensity,
phase, polarity, waveform, and reflected angle of the reflected
waves). Information can thus be extracted from these measured
reflected wave parameters.
[0025] As described above, the adjustments of downforce and speed
may be made in a closed loop automated manner via the controller
178. Alternatively, in some constructions the depth consistency is
displayed to an operator (e.g., on a visual display) and the
operator can manually make adjustments to the downforce and/or
speed as desired based on the signals from the depth sensor(s)
148.
[0026] While various different types of sensors 148A, 148B, 148C
and associated methods are described herein, the seeding machine 10
may include and implement any one or more of the sensors and
methods, or a combination thereof. Additionally, the sensors 148A,
148B, 148C described herein may be disposed at various locations,
including not only the exemplary locations explicitly disclosed.
Additionally, the seeding machine 10 may use at least one
controller, such as the controller 178, to receive signals from any
of the sensors 148A, 148B, 148C described herein, and to use those
signals to control one or more elements on the seeding machine 10
and/or to perform calculations relating to the seeding machine 10
(e.g., corresponding to furrow depth, positioning of components,
etc.).
[0027] Following are several clauses describing various embodiments
and concepts disclosed herein:
[0028] Clause 1. A row unit for a seeding machine operable to plant
seeds into soil, the row unit comprising: a frame supporting a
furrow opener for opening a furrow in the soil, a gauge wheel for
rolling atop the soil, a seed meter for dispensing seeds into the
furrow, and a furrow closer for closing the furrow; a downforce
adjustment mechanism operable to push the row unit frame toward the
soil to engage the furrow opener, the gauge wheel, and the furrow
closer with the soil; a ground view sensor operable to sense the
furrow and generate depth signals corresponding to actual sensed
depth of the furrow; and a controller configured to receive the
depth signals and output a control signal to the downforce
adjustment mechanism, wherein the controller is programmed to
adjust the downforce adjustment mechanism to adjust a downforce on
the frame based on the depth signals such that downforce is
increased in response to the depth signal indicating a depth less
than a set point depth, and downforce is decreased in response to
the depth signal indicating a depth greater than the set point
depth.
[0029] Clause 2. The row unit of clause 1, wherein the controller
is programmed to carry out closed-loop furrow depth adjustment
through the depth signals and control of the downforce adjustment
mechanism.
[0030] Clause 3. The row unit of clause 2, wherein the controller
is further configured to carry out the closed-loop furrow depth
adjustment with soil moisture content data delivered to the
controller from the ground view sensor.
[0031] Clause 4. The row unit of clause 1, wherein a height
difference, measured perpendicular to a soil top surface, between
respective lowest points of the gauge wheel and the furrow opener
defines a furrow depth setting, wherein the furrow depth setting is
adjustable and used by the controller in determining the set point
depth, and wherein the adjustment of the downforce by the
controller is configured to further adjust actual furrow depth,
without changing the furrow depth setting.
[0032] Clause 5. The row unit of clause 1, wherein the ground view
sensor is operable to emit sound or electromagnetic radiation into
the furrow and to detect a reflection of the sound or
electromagnetic radiation in order to sense the furrow.
[0033] Clause 6. The row unit of clause 1, wherein the ground view
sensor comprises an infrared sensor.
[0034] Clause 7. The row unit of clause 1, wherein the ground view
sensor comprises an ultrasonic sensor.
[0035] Clause 8. The row unit of clause 1, wherein the ground view
sensor is one of a plurality of ultrasonic sensors spaced along a
longitudinal direction of the row unit that extends between the
furrow opener and the furrow closer.
[0036] Clause 9. The row unit of clause 8, wherein the plurality of
ultrasonic sensors includes at least one ultrasonic sensor operable
to view the ground outside the furrow.
[0037] Clause 10. The row unit of clause 1, wherein the ground view
sensor comprises a radar transmitter and receiver.
[0038] Clause 11. The row unit of clause 1, wherein the ground view
sensor comprises an optical emitter and receiver.
[0039] Clause 12. The row unit of clause 1, wherein the ground view
sensor is positioned on the frame to be longitudinally aligned with
the furrow opener and the furrow closer.
[0040] Clause 13. A control system for adjusting downforce on a row
unit for a seeding machine based on depth of a seeding furrow, the
control system comprising: a ground view sensor operable to sense
the furrow and generate depth signals corresponding to actual
sensed depth of the furrow; and a processor configured to receive
the depth signals from the ground view sensor and further
configured to send signals to the downforce adjustment mechanism to
adjust a downforce based on the depth signals in order to provide
closed-loop furrow depth adjustment.
[0041] Clause 14. The control system of clause 13, wherein the
processor is configured to adjust the downforce based additionally
on signals received from at least one additional ground view sensor
on the row unit.
[0042] Clause 15. The control system of clause 13, wherein the
controller is further configured to provide the closed-loop furrow
depth adjustment by using soil moisture content data that is
derived from analog parameters and/or digital data of the ground
view sensor and delivered to the controller.
[0043] Clause 16. The control system of clause 13, wherein the
ground view sensor is operable to emit sound or electromagnetic
radiation into the furrow and to detect a reflection of the sound
or electromagnetic radiation in order to generate the depth
signals.
[0044] Clause 17. The control system of clause 13, wherein the
ground view sensor is one of a plurality of ultrasonic sensors,
including at least one ultrasonic sensor operable to view the
ground outside the furrow.
[0045] Clause 18. The row unit of clause 13, wherein the ground
view sensor comprises a radar transmitter and receiver.
[0046] Clause 19. The row unit of clause 13, wherein the ground
view sensor comprises an optical emitter and receiver.
[0047] Clause 20. The row unit of clause 13, wherein the ground
view sensor is arranged to view along a center of a width of the
furrow.
[0048] Any of the above referenced aspects of the disclosure can be
combined with any one or more of the above referenced aspects of
the disclosure.
[0049] Various features and advantages of the disclosure are set
forth in the following claims.
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